Mona Lisa smile — Vatican restoration notes from the 1950s describe her as 'somber.' Current painting is not somber.

The smile thing is real and I don't think it's a perception issue. I've been researching this since I did a semester abroad in Florence in 2009 and spent way too much time at the Louvre later that year. (The painting is in Paris, not Florence, yes I know, but you go to both when you're on a Eurail ……